These regulations shall apply to the subdivision and re-subdivision of land, as herein defined, located within the corporate limits of the City of Middletown, Connecticut. No subdivision or re-subdivision of land shall be made by any person, firm, or corporation until an application for such subdivision or re-subdivision has been submitted to and approved by the Middletown Planning and Zoning Commission, and a map thereof has been endorsed by the Commission and filed by the Planning and Zoning Department in the Middletown Office of the City/Town Clerk.